{<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<body>
<div id="app">
<todo-item></todo-item>
<input type="text" v-focus>
</div>
<script>
// 定义名为 todo-item 的新组件
Vue.component('todo-item', {
template: '<li>这是个待办项</li>'
})
var app = new Vue({
el: '#app',
directives: {
focus: {
inserted(el) {
console.log(el) //<input type="text">
el.focus()
}
}
}
})
</script>
</body>
</html>}
